The man to speak to is Andy Barraclough at CAI (Caerbont Automotive Instruments) Smiths new owners. +44(0)1639 732299. I spoke to him about a year ago and he had all the answers. The Classic series is very close to original. 1/2(half)V black bezel is closest but won't pass SVA test if proud of dashboard. Rounded Bezel is SVA compliant.
CAI website Greengauges website Old Smiths thread
Hope this helps